Pink was a child, but not the innocent and cheerful type. More like the bratty, insolent and spoiled type.

Though she seem to have been a defect. A defective diamond must being quite the terrible thing to suffer, considering she is supposed to be a flawless leader, yet isn't taller than Garnet. Maybe that's why she had that attitude, to try to compensate her physical short-comings.

Woah
This entire scene explains the standings between pink & yellow.
I feel it also solidifies blue zircons testimony.